Malicious PDF — malware analysis report

Static analysis result for SHA-256 cde2b4d61efb99be…

MALICIOUS

PDF

68.3 KB Created: 2020-12-19 19:17:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ea311a31980b770b81ba108e1abe347 SHA-1: 6bd9fb56a8d5cb4f56ce8c00e22f19fb9f6d300d SHA-256: cde2b4d61efb99bee330c53ab1dadea4792cac0f319290b927ac673329bd4c76
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with several pointing to disposable hosting services and potentially malicious domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to contain metadata rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafffi.ru/123?utm_term=schumacher+speedcharge+1.5+amp+manual
    • https://gadigode.weebly.com/uploads/1/3/2/6/132680949/wizinitukenere.pdf
    • https://cdn-cms.f-static.net/uploads/4481520/normal_5faf469f2b615.pdf
    • https://cdn-cms.f-static.net/uploads/4416321/normal_5f9a9817a5974.pdf
    • https://popetufuwude.weebly.com/uploads/1/3/1/4/131483025/fipatoxekuvubozodo.pdf
    • https://livadasim.weebly.com/uploads/1/3/4/3/134312527/9618709.pdf
    • https://cdn-cms.f-static.net/uploads/4389576/normal_5f97a298c82ee.pdf
    • https://xuguzopagar.weebly.com/uploads/1/3/4/4/134490213/2763145.pdf
    • https://zanagolebiwom.weebly.com/uploads/1/3/4/9/134900312/2439623.pdf
    • https://cdn-cms.f-static.net/uploads/4384825/normal_5fbc75bd46eff.pdf
    • https://cdn-cms.f-static.net/uploads/4465702/normal_5fb7d96de7bbf.pdf
    • https://dopuxaponaxu.weebly.com/uploads/1/3/2/6/132695391/rupotujaduzikij.pdf
    • https://cdn-cms.f-static.net/uploads/4488855/normal_5fc294ac8174d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc6f01bd8c365012834ab76/t/5fd644fede5b1220c026d3ab/1607877886894/54380316543.pdf
    • https://static1.squarespace.com/static/5fce832d2b66aa5e9eaf6edf/t/5fd645f65488895576a77a0d/1607878134790/71310747152.pdf
    • https://static1.squarespace.com/static/5fc2ca3a3dfdd95b60e15de0/t/5fc5921f18e72e5fdb96ca5f/1606783528780/84793303230.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5e3.bin
dbf6bbe9b3f07c1a7c65e9cb4eb3a224199a57f26b0e5079f7ebdca0697a275f
pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E3 5796 bytes
font_01_sfnt_off0000c981.bin
d96d772f90ea7e3c3ac42c74d3eb31343392db46515691e4d5c3de5993353ae9
pdf-font-stream PDF embedded font (sfnt) at offset 0xC981 10384 bytes
font_02_sfnt_off0000ed37.bin
3f83bbfb2e03141a9083badfb1da6e2b1773f9aa6b1ed8f30fc2d392a5ee3553
pdf-font-stream PDF embedded font (sfnt) at offset 0xED37 16140 bytes